Cosmic Gallery

In this undated image made available from NASA on Sunday March 5, 2006, which shows the central region of a group of galaxies 300 million light-years away known as Stephan's Quintet. The distant galaxy is generating a 'sonic boom' of cosmic proportions, astronomers have discovered, as one of the galaxies falls towards the others at high speed, ploughing through a cloud of hydrogen gas travelling at 540.6 miles per second - 100 times faster than the speed of sound. The effect of this is similar to the sonic boom created by a fast jet, according to astonomers at the American space agency Nasa, using the Spitzer space telescope, and their findings are to be published later in March, in the Astrophysical Journal. (AP Photo / Nasa via Pa)

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